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1·The band can not only play a few hundred Roop music, but also playing acoustic guitar can be carried out.

乐队不仅可以玩儿转几百首鲁普音乐，还可以进行吉他和声演奏。

2·Forward support bolt combined with roop rock by bolting can play a roll of combined beam, which can prevent roof rock caving immediately after explosion.

超前支护锚杆锚固后与顶板岩石构成一体，这样使超前锚杆形成组合梁作用，放炮后，能够阻止顶板岩石冒落。